[DRE-maint] Processed: update gitaly to 12.9.2

[Debian Bug Tracking System]

Processing control commands:

> block 956218 by -1
Bug #956218 [gitlab] Update gitlab to 12.9.x release
956218 was not blocked by any bugs.
956218 was not blocking any bugs.
Added blocking bug(s) of 956218: 956299

-- 
956218: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=956218
956299: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=956299
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